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S. A. WAUGH. METHOD OF MANUFACTURING GBINDING WHEELS.

APPLICATION FILED MAY 3, ISIZ.

Patented 001. 14,1919.

I In ventor: Savage!!! lllzy,

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- his Atty.

UNITED STATES PATENT OFFICE.

SAMUEL A. WAUGH, OF REVERE, MASSACHUSETTS, ASSIGNOR TO REVERE RUBBER COMPANY, A CORPORATION OF RHODE ISLAND. i

METHOD OF MANUFACTURING GRINDING-WHEELS.

To all whom it may concern:

Be it known that I, SAMUEL A. WAUGH, a citizen of the United States, residing in Revere, county of Suffolk, and State of lVIassachusetts, have invented certain new and useful Improvements in Methods of Manufacturing Grinding-\Vheels, of which thefollowing is a full, clear, and exact description.

This invention relates to grinding wheels and methods of manufacturing same, more particularly to grinding wheels for finishing relatively soft surfaces, such for instance as rubber covered iron rolls. The object of this invention is to produce a grinding wheel having the desired abrasive surface and great lasting qualities, which may be run at high speed without danger of exploding, andWh ch is capable of receiving a. new abrasive surface with a minimum of expense and equipment.

Heretofore it has been customary in the manufacture of grinding wheels to mix the abrasive material with a suitable binder to form a plastic mass, then shape the wheel therefrom in suitable molds or the like, and finally compact it by hydraulic pressure. By this invention I provide a method of manufacturing grinding wheels wherein the necessity of mixing the abrasive mate-.

rial. with the binder is obviated, and in which the grinding surface is applied to its core or form Without the use of molds, presses or the like.

For a clearer understanding of this invention, reference is made to the following specification and the accompanying drawing in which- Figure 1 is a perspective view, partly broken away of a grinding wheel made according to this invention, and

Fig. 2 is a cross sectional view of the grinding surface of the same.

.A suitable metal wheel or pulley 1 is finished to the required diameter and itsperipheral surface roughened in any deslred manner, as by cutting threads thereon. To

the thus roughened surface 2, I apply a coating of rubber solution or cement 3, the solution having compounded with it a suitable vulcanizing agent such as sulfur. The coating of solution 3 is then permitted to dry for a short period and a stratum 4 of comminuted abrasive superposed thereon. This I accomplish preferably by rolling the Specification of Letters Patent.

Patented Oct. 14, 1919.

Application filed May 3, 1917. Serial No. 166,135.

wheel in the abrasive, which adheres to the but of course a greater or less number may sometimes be desirable, the exact number varying according to the thickness of the rubber solution, the total depth desired, etc.

Having applied the desired amount of rubber and abrasive, the whole is allowed to dry until all of the solvent in the rubber has evaporated. This usually requires about three days. The wheel is then tightly wrapped to maintain the material in place during vulcanization. I have found that a satisfactory cure is accomplished by subjecting the wheel to a temperature of approximately 280 F.-for about five hours but this may be varied according to the amount of vulcanizing medium in the compound. To prevent possible displacement of the abrasive surface after vulcanization the wrappings are left in place for at least a day after removal of the wheel from the vulcanizing chamber; They are then removed, and after an additional ageing period of about two days the wheel is ready for use.

It may be seenth'at the above method is of particular advantage in that it obviates the necessity of providing molds and presses to shape and compact the abrasive wheel, also in that it obviates the step of mixing the abrasive compound in mills or other apparatus.

I have found that the abrasive surface produced by my method of manufacture has greater lasting qualities than in any of the types of grinding wheels heretofore provided for grinding relatively soft surfaces such as rubbercovered rollers.

When the abrasive surface of a wheel built according to my method has worn away, it can of course, be easily resurfaced by applying additional strata thereto by the same method as above outlined.

Wheels manufactured according to this invention do not explode When run at high speeds and their use therefore eliminates all danger of injury to workmen in this regard, a danger which is very serious When using the ordinary type of grinding Wheel.

Having thus described my invention, What I claim and desire to protect by Letters Patent is: i

1. The method of manufacturing grindingwheels Which consists in coating the surface of a metal core with rubber in a solvent and a vulcanizing agent, applying an abras1ve to the tacky surface of the rubber, reducing the solvent, repeating said steps until the desired strata have been apthe surface of a metal core alternate layers 20 of vulcanizable rubber solution and abra sive material, reducing the solvent by volatilization, and v'ulcanizing the article.

Signed at Chelsea, Mass, this 30th day of April, 1917.

- SAMUEL A. WAUGH. 

